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Which of the following statement is incorrect ?
jeemain
physics
class12
unit19
ch14
q49
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
For 12 pair of observation on $x$ and $y$ the $r$ calculated is $0.674$. The standard error is
jeemain
math
cbse
class11
statistics
medium
variance-and-standard-deviation
q41
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
The alkali metal used as coolant in nuclear reactors is
jeemain
chemistry
class11
s-block-elements
unit10
q84
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
If in a moderately skewed distribution the value of mode and mean are $ 6 \lambda \: and \: 9 \lambda$ respectively, then value of median is
jeemain
math
cbse
class11
statistics
medium
measures-of-dispersion-(mode)
q40
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
Glauber salt is a
jeemain
chemistry
class11
s-block-elements
unit10
q83
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
For approximately ten times increase in conductivity of a semiconductor the impurity to be added is of the order of
jeemain
physics
class12
unit19
ch14
q48
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Combined mean of two series $x_1\: and \: x_2$ when \[\] $x_1 = 210,\: x_2 = 150, \: n_1=50, \: n_2=100 $ is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(mean)
q77
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
On thirteen consecutive days the number of persons booked for violating speed limit of 40 km / hr were as follows. \[ \] 58, 61, 68, 57, 62, 50, 55, 62, 53, 54, 51, 59, 52 \[\] The median number of speed violations per day is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(median)
q77
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
The valancy of impurity atom added to silicon to make it P type is
jeemain
physics
class12
unit19
ch14
q47
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The 70th percentile is equal to
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion
q76
asked
Jan 28, 2014
by
thanvigandhi_1
1
answer
The forbidden gap in energy bands in silicon is order of
jeemain
physics
class12
unit19
ch14
q46
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
Pearl ash is
jeemain
chemistry
class11
s-block-elements
unit10
q82
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which of the following salt would give $SO_2$ with hot and dil. $H_2SO_4$ and also decolourise $Br_2$ water?
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
Which is doped heaviest in a transistor
jeemain
physics
class12
unit19
ch14
q45
easy
semiconductor-electronics
concepts
asked
Jan 28, 2014
by
meena.p
1
answer
The average translational kinetic enegry of Oxygen molecules (molecular weight of $O_2$ is 32) at a particlular temperature is 0.032eV. What is the average translational kinetic energy of $N_2$ molecules (molecular weight is 28) at the same temperature
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
kinetic-interpretation-of-temperature
easy
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
Which among the compounds of alkali metals undergo hydrolysis
jeemain
chemistry
class11
s-block-elements
unit10
q81
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
A change of 10 mA in the emitter current produces a change of 7.5 mA in collector current in a transistor . What should be change in base current to produce the same change in collector current.
jeemain
physics
class12
unit19
ch14
q44
easy
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
A vessel is filled with an ideal gas at 76 cm of Hg (mercury). The mass of gas is increased by 25% by introducing more gas at the same temperature. What is the resultant pressure of Hg in cm?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
kinetic-theory-of-an-ideal-gas
pressure-of-an-ideal-gas
easy
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
The alkali metal bi carbonate that has no existance in solid state is
jeemain
chemistry
class11
s-block-elements
unit10
q80
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Tincal contains mainly
jeemain
chemistry
class11
s-block-elements
unit10
q79
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
What is the formula of calgon?
jeemain
chemistry
class11
s-block-elements
unit10
q78
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which of the following is best $CO_2$ absorber as well as source of $O_2$ in space capsule?
jeemain
chemistry
class11
s-block-elements
unit10
q77
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which of the following salts does not form any ppt with excess of NaOH ?
jeemain
chemistry
class11
s-block-elements
unit10
q76
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
The energy density of an ideal monoatomic gas is equal to:
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-interpretation-of-temperature
medium
energy-density
atomicity
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
Considering greater polarization in lid compared to that in NaCl,which of the following statements you would expect to be wrong?
jeemain
chemistry
class11
s-block-elements
unit10
q75
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
The $x$-components of velocity of some particles (in $km/s$) are $6,4,2,0,-2,-4,-6$. The root-mean-square (rms) velocity calculated from these data (in $km/s$) is nearest to?
speed-of-molecules
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
kinetic-interpretation-of-temperature
medium
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
A given sample of ideal gas is made to undergo a process in which the temperature decreases by 10% and the pressure decreases by 8%. By what % does the volume change?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 28, 2014
by
balaji.thirumalai
1
answer
An aqueous solution of coloureless metal sulphate M gives a white precipitate with $NH_4OH$. This was soluble in excess of $NH_4OH$. On passing $H_2S$ through this solution a white ppt is formed. The metal M in the salt is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid, a white precipitate with dilute $H_2SO_4$ but gives no precipitate with sodium chloride or iodide, it is
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
A transistor in common emitted mode the load resistance is $2k \Omega$ and the current gain $\beta =50,$ What is the power if input resistance is $500 \Omega$
jeemain
physics
class12
unit19
ch14
q43
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
When negative voltage feedback is applied to an amplifier of gain 150, the overall gain falls to 15. Find the fraction of the output that is feedback to the input.
jeemain
physics
class12
unit19
ch14
q42
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
$K_4[Fe(CN)_6]$ can be used to detect one or more out of $Fe^{2+}, Fe^{3+}, Zn^{2+}, Cu^{2+}, Cd^{2+}$
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
In castner-kellner cell used for the manufacture of NaOH,the cathode in the central compartment is made up of
jeemain
chemistry
class11
s-block-elements
unit10
q74
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
The salt used for performing bead test in inorganic qualitative analysis is
jeemain
chemistry
class11
s-block-elements
unit10
q73
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
$NH_4CNS$ can be used to test one or more out of $Fe^{3+}, Co^{2+}, Cu^{2+}$
jeemain
chemistry
practical-chemistry
difficult
asked
Jan 28, 2014
by
mosymeow_1
1
answer
In an amplifier, negative feedback is introduced with feedback fraction $\beta =0.01$. If voltage given with out negative feed back. is $2500$ what is voltage gain with negative feed back.
jeemain
physics
class12
unit19
ch14
q41
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
Four alkali metals A,B,C and D are having standard electrode potentials as -3.05,-1.66,-0.40 and 0.80v respectively,which one will be the most reducing agent?
jeemain
chemistry
class11
s-block-elements
unit10
q72
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
$CO+NaOH\rightarrow $?
jeemain
chemistry
class11
s-block-elements
unit10
q71
difficult
asked
Jan 28, 2014
by
sreemathi.v
1
answer
In an n-p-n transistor only $3 \%$ of the charge carriers are allerved to recombine in the base region. The value of $ \alpha$ is
jeemain
physics
class12
unit19
ch14
q40
medium
transistors
semiconductor-electronics
pn-junction
asked
Jan 28, 2014
by
meena.p
1
answer
The metal which gives brick red colour in flame test is
jeemain
chemistry
class11
s-block-elements
unit10
q70
medium
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Oxides of alkaline earth metals are stable due to
jeemain
chemistry
class11
s-block-elements
unit10
q69
medium
asked
Jan 28, 2014
by
sreemathi.v
1
answer
What is the emitter current $I_E$ in a transfer where base current $I_B$ is $20 \mu A$ and $\beta =40$
jeemain
physics
class12
unit19
ch14
q39
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
What is the output resistance, When we observe in a common emitter circuit the collector current increase from $9.5 \;mA\;to 10\;mA$ When the collector voltage increase from $2.5 \;to \;6v$ When base current is kept constant .
jeemain
physics
class12
unit19
ch14
q38
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
The salt which gives crimson red colour in flame test is
jeemain
chemistry
class11
s-block-elements
unit10
q68
medium
asked
Jan 28, 2014
by
sreemathi.v
1
answer
To what series does the spectral lines of atomic hydrogen belong if its wave number is equal to the difference between the wave numbers of the following two lines of the Balmer series 486.1 and 410.2 nm?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q150
asked
Jan 28, 2014
by
sharmaaparna1
1
answer
Which of the following metals cannot give flame tests?
jeemain
chemistry
class11
s-block-elements
unit10
q67
medium
asked
Jan 28, 2014
by
sreemathi.v
1
answer
The electrical conductivity in aqueous solutions is high for
jeemain
chemistry
class11
s-block-elements
unit10
q66
medium
asked
Jan 28, 2014
by
sreemathi.v
1
answer
Which does not form peroxides?
jeemain
chemistry
class11
s-block-elements
unit10
q65
medium
asked
Jan 28, 2014
by
sreemathi.v
1
answer
A series of lines in the spectrum of atomic H lies at wavelengths 656.46 , 486.27 , 434.17 , 410.29 mm. what is the wavelength of next line in this series?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
difficult
q149
asked
Jan 28, 2014
by
sharmaaparna1
1
answer
Magnesium burns in air giving two products .Their formulae are
jeemain
chemistry
class11
s-block-elements
unit10
q64
medium
asked
Jan 28, 2014
by
sreemathi.v
1
answer
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